<div class="row btns-row btns-same-width-lg">
  <div class="col-sm-4 col-xs-6"><button type="button" class="btn btn-primary btn-lg">Primary</button></div>
  <div class="col-sm-4 col-xs-6"><button type="button" class="btn btn-success btn-lg">Success</button></div>
  <div class="col-sm-4 col-xs-6"><button type="button" class="btn btn-info btn-lg">Info</button></div>
  <div class="col-sm-4 col-xs-6"><button type="button" class="btn btn-default btn-lg">Default</button></div>
  <div class="col-sm-4 col-xs-6"><button type="button" class="btn btn-warning btn-lg">Warning</button></div>
  <div class="col-sm-4 col-xs-6"><button type="button" class="btn btn-danger btn-lg">Danger</button></div>
</div>